Spark-plug.



9 w, y M v I. A. SODEN.

SPARK PLUG. APPLICATION FlLED JUNEZ3, 19.15.

sheensilos. 1

. messes.

To all whom it may concern:

I 3 Be it knownthat I, Jossrri A. 80mm,

a citizen of the United States, residing at Toledo, in the county ofLucas and State of Ohio, haveinvented new anduseful'Improyements in'Spai'k Plugs, lot which the a following" is a specification.

' useful improvements-in spark plugs for hy- This invention relates tocertain novel and duo-carbon engines and has particular application tothe core or holder for the power electrode. v r

In carrying out the present invention it is my purpose to provide aspark. plug wherein the power electrode will be securely andefi'ectively held in posit-iorii'n thecore or'electrode holder so thataccidental displacement of'the-jpowerelectrode from the core, in theoperation f0f ,the engine, will I I 3w1llbe eliminated. After thegasketfijs be eliminated. I p

It is also myupurpose to provide a spark plug wherein the power.electrode will be" independent of the bindingpost and Wl1818-' in thebinding post m be readily removed from the spark plug without disturbingthe coiinectioirbetween' the plug and the power electrode! P i i i Viith the, above recited objects inview and others of a like nature theinvention consists in the construction, combination 4 and arrangement ofparts hereinafter set tional view through the spark plug. Fig. is atransverse sectional VIEW there section and having oneend'screw-threaded inc-engage in the opening in the wall n the; '45

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Referring now to the drawing in detail 1 designates a metallic shellcircular in cross cylinder of the engine,"while 2 indicates a core orelectrode holder disposed within the body 1, end suitably securedtherein and formed of porcelain or'otherappropriate insiilatingmaterial. The groundelectmde'is secured to the cylinder end of the shell1, as usual, while formed in the-core 2 is an axial bore 3 and the outerend of the bore 3 is circuinferentially enlarged as at l.- The side Wallof the circiiinferentially enlarged portion -11. of 'the bore taperstoward the outer end [of the core and increases its. di-

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Specification of Letters Patent.

ameter towardv such end of the" core. Disposed Within the bore 3 in thecore2 is a- Patented am. e, 191. Application mean ess, 1915. Seria1N0.35,89 7.- 4 1 power electrode having; one end, thereof spaced apart from.the ground electrode on tlieshell. 1 tojorm the spark gap of theplug andthe "opposite end projecting be yond the outer end of the core V6designates a gasketcomposed of copper and asbestos. This gasket isdisposed within the circumferentially enlarged portion 4 of the bore 3and surrounds the portion of theele'ctrode 5 within" such enlarged partof the bore and is adapted to be driven downwardly withintheenlarged'portion of the here so as'to bind against thetaperin'g sideWall of such enlarged portion thereby forming a secure connectionihetveen the electrode and the" core 50- that accidental movement of theelectrode 5 withinithelhore driven home, a, filler 7 'of cement oranalogous materi'al'is poured into the outer end of thecircumferenrially enlarged portion gof the bore and such filler acts tohold the -gasket in proper p'ositionin the bore.-

In the present instance, the side wall of the core 2 adjacent to theouter end thereof 1 isunde'rcut to form a shoulder 8 and dis posed uponthe outerend of the core 2 is a cup-shaped cap bearing 9 having the edgeof theside all thereofhent inwardly to enis preferably hollow and theinner end portion thereof surroimds the adjacent end of,

the electrode and isin contact therewith Formed integral with the endwall is a binding? post 10 This binding-post 10 so as to fornranelectrical connection between the binding" post and the 'iowerelectrode. This binding post 10 is adapted to receive the terminal ofthe current carrying I wireiand is equipped with a nut or theiike toinsure a positive connection hetweenthe chrreni; carrying conductor aiidthe binding post.-

the hereof the shell 1 is ciroumferentially enlarged as at 11 and formedat the juno Ii the present instance, the outer end of r I ture of thecircumferentially enlarged per tion 11. with the inner end port on ofthebore is a shoulder 12 The portion of the electrode holder 2 within thecircumferem 'tiallv enlarged portion 11 of the here of the shell iscircumferei tially enlarged at 13 while the extremity of the electrodeholder 2 projecting into the lower portion of the bore in the shell 1.tapers outwardly as at 14: and at the juncture of the enlarged portion13 with the tapering portion 14 a shout der 15 is formed.

Encircling the base of the tapering portion H and seated against theshoulder 15 is a gasket 16. while surrounding the ciu cunit'erentiall3enlarged portion 13 of the electrode holder is a jacket 17 constructedof some suitable metal and having the lower end thereof flanged inwardlyas at 18 and engaging the gasket 10 to hold thelatter against theshoulder 15. The remaining edge of the jacket 17 is pressed over theshoulder formed at the juncture of the outer end portion of theelectrode holder with the clrcumferentially enlarged portion 13 so thatthe jacket may be held in proper position upon the electrode holder. Theflange 18 on the jacket 17 rests upon the shouL der. 12 with theelectrode holder disposed within the shell 1; and in order to hold theelectrode holder securely within the shell a gland 19 is disposed aboutthe electrode holder 2 and threaded into the circumferentially enlargedportion 11 of the shell and the inner end of the gland 19 engages theshoulder formed at the juncture of the circumferentially enlargedportion 13 of the electrode holder with the outer end portion of suchshoulder and so cotiperates with the shoulder 12 to secure the electrodeholder in the shell.

It will be seen that I have provided a spark plug wherein the po 'erelectrode is securely and ell'cctive'ly he 1 in the core.

while the outer end of such electrode is detachahl associated with thebinding post thereby enabling" the binding postto he removed from themire when it is desired without disturhing' the couumrtion between theelectrode and the core.

claim in a spin-h plug, a shell having one end portimi adapted to enterthe opening in the cylinder and the here at the other end portioncircuuilerenlially enlarged to .t'orm a shoulder. an electrode holderhaving one end pm-tion disposed within said shell andcirrunittercntially enlarged to correspond to the tion. of said shelland hearing against the enlarged portion of said electrode holder tosecure the latter Within the shell, a power electrode carried by saidelectrode holder, and a ground electrode connected to the inner end ofsaid shell.

In testimony whereof I my signature in presence of two witnesses.

JOSEPH A. HOLDEN. l Vitnesses: Mrs. Josnrn A. Sooner,

Max Bnu'cuim N.

